MPE/iX Glossary of Terms and Acronyms (32650-90887)

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Glossary of Terms
being bent or having the media corrupted by physical handling). A hard
disk generally comes in packs consisting of several platters instead of just
one. Some disk packs can be removed from the disk drive.
hard reset A method to reset the computer or a terminal. A hard reset erases all
information in memory. See soft reset.
hardware All the physical components of the computer, including the CPU cabinet,
tape drives, disk drives, terminals, and other peripherals.
hardware installation The process of physically connecting the hardware of a computer
system together.
hard-wired In a hard-wired computer, the instruction set is implemented directly in
the CPU.
hard-wired direct connection A direct connection between a computer and a terminal
or between two computers over a relatively short distance using copper
wire pairs, coaxial cable, or fiber optics. The signals are transmitted in
digital format.
hard-wired terminal A terminal directly connected to the computer system by a length
of cable.
head The physical mechanism on a disk or tape drive that reads data from, and
writes data to, the disk or tape. The head on a disk drive does not normally
make physical contact with the surface of the media, but the tape head
does.
header The first page printed when output is directed to a line printer. It contains
the session name (if designated), the session number, logon identification,
day of the week, date, and time. It corresponds to the trailer printed as the
last page of the output.
Help facility An online utility providing information on all MPE commands.
Information can be accessed by topic areas and tasks.
Hewlett-Packard (HP) A Fortune 500 company founded by Bill Hewlett and Dave
Packard in 1939. Hewlett-Packard is a producer of computers and
headquarters is located in Palo Alto, California, U.S.A.
Hewlett-Packard Data-Link Control II (HP-DLC-II) A Hewlett-Packard high-level
data-link (HDLC) standard that defines the elements and procedures for a
balanced, bit-oriented, Level II of the Open Systems Interconnection (OSI)
model protocol.
Hewlett-Packard Graphics Language (HP-GL) The graphics instruction set for
Hewlett-Packard film recorders and plotters.
Hewlett-Packard Interface Bus (HP-IB) The HP-IB channel consists of an HP-IB
cable connected to an HP-IB interface card that is connected to the
system's backplane. It performs protocol translation between the CPU and
HP-IB. For the 900 Series HP 3000 up to six devices can be connected to a
single HP-IB channel. Disk drives, tape drives, and system printers are
connected by an HP-IB which is HP's implementation of the IEEE
standard 488-1975 interface.